KR20170096555A - Method and apparatus for hybrid automatic repeat requests (harq) processing for retransmissions with unknown data length - Google Patents

Abstract

A system, method, and apparatus for wireless communication are provided. The receiver may receive data from a wireless transmitter, and the receiver may receive the data retransmitted from the wireless transmitter, the receiver may store the data, Processing the data without information on the length of the data, and the receiving unit determining the data length of the data.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a HARQ processing method and apparatus for retransmitting a signal including data length information,

The present invention relates to a HARQ processing method and apparatus for retransmission of a signal including data length information.

The user of the electronic device requires an increase in the functionality of the applications and services provided by the electronic device and the communication network used to access the device. Increasing the bandwidth and stability of wireless communications connecting other electronic devices and communication network electronic devices is of increasing importance for user satisfaction. One of the challenges faced by wireless communication receivers with respect to electronics is to extract data transmitted from a received radio signal with reduced error. The technique used by receivers to reduce transmission errors is hybrid automatic repeat requests (HARQ). HARQ is a combination of high data rate, error correction coding and automatic repeat request error control.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and apparatus for retransmission of the same transport block in a wireless network system using an ACK / NACK (acknowledgment / negative acknowledgment) mechanism, And to provide an HARQ processing method and apparatus.

Another object of the present invention is to provide a HARQ processing method and apparatus in which appropriate HARQ processing and storage buffer management are provided even when the data length of a transport block before encoding is unknown to a receiver.

The problems to be solved by the present invention are not limited to the above-mentioned problems, and other matters not mentioned can be clearly understood by those skilled in the art from the following description.

According to another aspect of the present invention, there is provided a HARQ processing method, wherein a receiver receives data from a wireless transmitter, and the receiver receives the data retransmitted from the wireless transmitter, The receiving unit stores the data, the receiving unit processes the data without information on the length of the data, and the receiving unit determines the data length of the data.

In some embodiments of the present invention, the processing of the data by the receiver may perform hybrid automatic repeat request (HARQ) processing before performing rate rate dematching.

In some embodiments of the present invention, the receiving unit processes the data by combining and storing multiple blocks of received data, and for receiving multiple data lengths for each of multiple data lengths Performing rate de-matching on the combined and stored blocks with respect to the received data, blind decoding the rate-rejected blocks with respect to the received data for each of a plurality of data lengths, And determining a data length based on the rate inverse and the blind decoded block with respect to the data.

In some embodiments of the invention, determining the data length may comprise performing an operation on statistical metrics obtained from the blind decoding.

In some embodiments of the present invention, the receiving unit processes the data to perform rate dematching on a received data block for each of multiple data lengths, Combining and storing the rate-mismatched received data blocks for each data length, blind decoding the combined and stored blocks for received data for each of a plurality of data lengths, And determining the data length based on the blind decoded block.

In some embodiments of the present invention, the receiving unit processes the data by performing a rate reversal on a block of the received data for a plurality of data lengths and performing a rate reversal on each of the plurality of data lengths Blind decoding of the received data, and storing the received data associated with the selected data length in a single HARQ buffer.

In some embodiments of the present invention, the retransmission of the data to the receiver may be performed by the wireless transmitter not performing NACK.

In some embodiments of the present invention, the wireless transmitter may include a communication protocol associated with at least one of D2D, MTC, 5G, LTE, LTE-A, CDMA, WCDMA, UMTS, WiBro, GSM, Wi-Fi, Bluetooth, Can be executed.

In some embodiments of the invention, the data may be transmitted by a transport block.

According to another aspect of the present invention, there is provided a wireless communication apparatus including a receiving unit and a storage unit, wherein a transmitting unit transmits data to the receiving unit and the data is retransmitted to the receiving unit, Stores the received data, and the receiver processes the received and stored data without information on the data length, and determines the data length of the data.

In some embodiments of the present invention, the receiving unit may perform HARQ processing before performing the rate reverse registration.

In some embodiments of the present invention, the receiver may combine and store multiple blocks of received data, rate-match the combined and stored blocks for received data for each of a plurality of data lengths, Blind-decode the rate-rejected block with respect to the received data for each data length, and determine a data length based on the rate-inverse-matched for the received data and the blind decoded block.

In some embodiments of the invention, the data length may be determined by performing an operation on statistical metrics obtained from the blind decoding.

In some embodiments of the present invention, the receiver is configured to perform rate dematching on a received data block for each of multiple data lengths, and to perform rate dematching on each of the plurality of data lengths, To combine and store transmit rate mismatched received data blocks, blindly decode the combined and stored blocks for received data for each of a plurality of data lengths, and combine and store , The data length may be determined based on the blind decoded block.

In some embodiments of the present invention, the receiver may perform a rate dematching on a block of the received data for multiple data lengths, Rate blind decoding of a block with a rate-matched block, selecting a data length between the plurality of data lengths, and storing the received data associated with the selected data length in a single HARQ buffer.

In some embodiments of the present invention, retransmission of the data to the receiver may be performed with the transmitter not performing NACK.

In some embodiments of the invention, the transmitter may execute a communication protocol associated with at least one of D2D, MTC, 5G, LTE, LTE-A, CDMA, WCDMA, UMTS, WiBro, GSM, Wi-Fi, Bluetooth, .

In some embodiments of the invention, the data may be transmitted by a transport block.

In order to accomplish the above object, in a mobile communication system according to some embodiments of the present invention, a chipset for controlling a user equipment includes: a receiver for receiving data transmitted by a radio transmitter, receiving the data retransmitted by the radio transmitter, And a chipset for storing the data, processing the data without information on the data length, and determining the length of the data.

In some embodiments of the invention, the mobile communication system may be at least one of D2D, MTC, 5G, LTE, LTE-A, CDMA, WCDMA, UMTS, WiBro, GSM, Wi-Fi, Bluetooth and NFC.

Other specific details of the invention are included in the detailed description and drawings.

1 is a schematic block diagram of an electronic device in a network environment according to an embodiment of the present invention.
2A is a block diagram of a portion of a receiver for wireless communication in accordance with an embodiment of the present invention.
2B is a block diagram of a portion of a receiver for wireless communication in accordance with an embodiment of the present invention.
3 is a flowchart illustrating an operation of HARQ processing according to an embodiment of the present invention.
4 is a flowchart illustrating an operation of HARQ processing according to an embodiment of the present invention.
5 is a flowchart illustrating an operation of HARQ processing according to an embodiment of the present invention.
FIG. 6 is a diagram illustrating a decrease in frame error rates (FER) in wireless communication by HARQ processing according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

It is to be understood that when an element is referred to as being "connected to" or "coupled to" another element, it can be directly connected or coupled to another element, One case. On the other hand, when an element is referred to as being "directly coupled to" or "directly coupled to " another element, it means that it does not intervene in another element. "And / or" include each and every combination of one or more of the mentioned items.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that the terms "comprises" and / or "comprising" used in the specification are intended to be inclusive in a manner similar to the components, steps, operations, and / Or additions.

Although the first, second, etc. are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical scope of the present invention.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

1 is a schematic block diagram of an electronic device in a network environment according to an embodiment of the present invention.

In a networked environment, the electronic device 100 includes a communications block 110, a processor 120, a memory 130, a sensor block 140, a display 150, an input / output block 160, an audio block 170, And a transmitter 180.

The electronic device 100 includes, but is not limited to, a communications block 110 for other electronic devices or network connections for voice and data communications. The communication block 110 may include a wide area, a local area, a personal area, a near field, a device to device (D2D), short range communications, and an MTC machine type communications. The functionality of communication block 110, or a portion thereof, may be implemented by a chipset.

In particular, the cellular communication block 112 may communicate with other electronic devices via a terrestrial base station transceiver or directly to a wide area network using technologies such as D2D, MTC, LTE, 5G, LTE-A, CDMA, WCDMA, UMTS, WiBro, (wide area network) connection. The cellular communication block 112 may comprise one or more of a number of communication devices such as a chipset, a low noise amplifier, a demodulator, a detector, a descrambler, a deinterleaver, a HARQ processor, rate dematcher, and a receiver 113, which may include a channel decoder.

The WiFi communication block 114 provides a local area network connection via network access points using a technology such as IEEE 802.11. The Bluetooth communication block 116 provides personal area network communication using a technology such as IEEE 802.15. NFC communication block 118 provides point-to-point, near-field communication using standards such as ISO / IEC 14443. [

The communication block 110 also includes, but is not limited to, a GPS satellite signal receiver 119. The GPS satellite signal receiver 119 receives GPS signals to compute the absolute position, velocity, acceleration and time of the device. The electronic device 100 may be provided with power for operation of the functional blocks from the battery. Transmitter 180 may comprise a base transceiver station (BTS) or user equipment (UE).

The processor 120 provides the processing functionality of the application layer required by the user of the electronic device 100. The processor 120 also provides commands and control functions for various blocks within the electronic device 100. [ The processor 120 provides an update of the control functions required by the functional blocks. The processor 120 may provide coordination of resources required by the receiver 113, including communication control between functional blocks.

The processor 120 may also update the firmware, database, and library associated with the receiver 113. The cellular block 112 may also have a local processor or chipset that computes resources for the receiver 113 and other functional blocks needed for cellular communication.

Memory 130 provides storage for device control program code, user data storage, application code, and data storage. The memory 130 may provide data storage for the firmware, library, database, lookup table, and calibration data required by the receiver 113.

The database may include a lookup table or the like. The program code and the database required at the receiver 113 may be loaded from the memory 130 into the local storage in the receiver 113 at device boot time. Receiver 113 may also have local nonvolatile memory for storing program code, libraries, databases and lookup table data.

The sensor block 140 may include a physical sensing device for sensing physical conditions inside and outside the electronic device 100. Sensor block 140 may also include electronic conditioning circuits and software to control sensor data manipulation and use thereof by other blocks within electronic device 100.

The display 150 may be a touch panel and may be implemented as a liquid crystal display (LCD), a light emitting diode (LED) display, an organic light emitting diode (OLED) display, or an active matrix type light emitting diode (AMOLED). The input / output block 160 controls the interface to the user of the electronic device 100. Audio block 170 provides audio input and output to electronic device 100.

According to an embodiment of the present invention, a HARQ process between a user equipment (UE) (e.g., electronic device 100) and a transmitter 180 in a cellular communication network (e.g., a 3GPP data channel) Parameters, and procedures necessary to ensure compatibility and reliable communication.

First, in the HARQ process for the data channel, the cellular communication block 112 in the UE communicates with the transmitter 180 to inform the transmitter 180 whether the transport block has been received correctly (without error) or incorrectly received (error occurrence) An ACK (acknowledgment) or NACK (negative-acknowledgment) signal is transmitted. If the transport block is received incorrectly, a subsequent retransmission of the transport block is required.

Second, for each retransmission of the transport block, the code word format and size are determined by the receiver 113 to determine the size of the HARQ buffer based on the codeword length after rate dematching. . The receiver 113 may perform rate reverse registration to recover the mother code format and if the transmission of the current transport block is the first transmission, the receiver 113 sets the rate- During the retransmission of the transmission block (the transmission block received with the error is transmitted by the NACK signal to the transmitter 180 and the retransmission is required), the receiver 113 stores the data and the transmission rate between the subsequent new transmission and the previous transmission And performs soft HARQ combining of the demodulated data.

According to an embodiment of the present invention, the system stores transport blocks received from a previous transmission received with an error, and performs HARQ combining with the current transport block transmission without information on data length or format. However, the present invention is not limited thereto.

In an embodiment of the present invention, the data to be transmitted, received, stored, and processed refers to coded data (after applying the coding of the information data). The data length of the data means the length of the uncoded information data. For example, if the information data is 1010 and the coding scheme is to repeat each bit three times, then the coded data is 111000111000. Receiver 113 may include, but is not limited to, one HARQ buffer for storing previous transport block transmissions.

The receiver 113 may further comprise a decoder for performing individual transport block after soft combining or blind decoding for multiple transport block transmission. The receiver 113 may also determine the data length and format from the set of candidate data length and format after blind decoding.

In accordance with an embodiment of the present invention, the present system and method are characterized in that the retransmission of the same transport block transmitted by the transmitter 180 is controlled by an ACK / NACK feedback mechanism to receive the transport block correctly, Regardless, it occurs mandatory. Further, the data length before encoding may not be known to the receiver 113, and the HARQ processing and HARQ buffer management in the receiver 113 are required.

2A is a block diagram of a portion of a receiver for wireless communication in accordance with an embodiment of the present invention.

2A is a block diagram of a receiver 113 for HARQ processing for fixed and known data lengths. 2A, the detector 202 outputs the log likelihood ratios (LLRs) of the received transport block, the descrambler / deinterleaver 204 processes the LLRs provided from the detector 202, 206 restores the mother code format.

The HARQ processing unit 208 is further performed. If the current transmission is the first transmission, the rate reverse-mapped data is stored in the HARQ buffer. In the case of retransmission, soft HARQ combining of the data rate unmatched data between the new transmission and the previous transmission is performed. The channel decoder 210 further performs channel decoding on the HARQ-processed data.

2B is a block diagram of a portion of a receiver for wireless communication in accordance with an embodiment of the present invention.

2B is a block diagram of a receiver 113 that performs HARQ processing for an unknown data length. 2B, the detector 212 outputs log likelihood ratios (LLRs) of the received transport block, the descrambler / deinterleaver 214 processes the LLRs provided from the detector 212, and the HARQ processor 216 Performs HARQ processing on the descrambled / deinterleaved data.

The rate arbitrator 218 performs rate reverse mappings for the HARQ processed data. The channel decoder 220 further performs channel decoding on the data with rate-matched data. In HARQ processing for unknown data lengths, the order of HARQ processing and data rate correction is opposite to that for fixed and known data lengths.

In accordance with an embodiment of the present invention, the system includes a HARQ buffer that stores detector outputs LLRs of transmissions of each transport block prior to rate reverse mappings, and avoids decisions on fixed data length. However, the present invention is not limited thereto. Blind decoding is performed on the same LLRs stored in the HARQ buffer as follows: One decoding attempt is made for each data format by the LLRs being rate reversed according to the data length (its code length and other associated parameters) Or a set of decoding attempts is made. After blind decoding, when a plurality of decoding attempts pass a cyclic redundancy check (CRC) or other error detection criteria, the selection of the data length is performed on the input / output data provided by the decoder to select one data length Lt; RTI ID = 0.0 > metrics. ≪ / RTI >

According to an embodiment of the present invention, the system stores the transmission block received from the previous transmission by the receiver 113, and performs HARQ combining with the current transmission block transmission without the data length information. However, the present invention is not limited thereto. The data length is determined from a given set of spare data lengths after blind decoding. The systems and methods of the present invention handle data length selection of transport blocks received from multiple transmissions that do not know HARQ storage, soft combining, blind decoding and data length.

According to an embodiment of the present invention, the HARQ provides error detection and provides a control method for data transmission when the receiver 113 transmits ACK (receive without error) or NACK (receive with error) to the transmitter 180 to provide. Accordingly, the transmission block is retransmitted when the transmitter 180 receives the NACK message. The receiver 113 stores the transmission blocks received from each transmission and from each retransmission, and the signals in all transmissions can be combined for detection or decoding.

According to an embodiment of the present invention, HARQ may be implemented using chase combining (CC) and incremental redundancy (IR). In the IR, the transmitter 180 retransmits the same transport block with the same encoding parameters, although in CC the retransmission of the transport block with a different encoding parameter than the given given mother code may be selected.

In both CC and IR, the length of the information data is known to the receiver 113. [ Based on the conventional data length, the receiver 113 can perform a rate reverse registration on the transmission block received in each transmission in the same format as the mother code and store the result (or store it in the previous transmission) And the result can be combined with a rate-rejected transport block).

According to an embodiment of the present invention, the transmitter 180 may transmit a transport block encoded with a data length selected from a set of preliminary data lengths unknown to the receiver 113. [ In addition, the transmitter 180 may choose to transmit the same transport block a plurality of times to achieve a desired quality of service (QOS). The retransmission may or may not depend on the feedback signal of the receiver 113, such as ACK / NACK for the transmitter 180.

When ACK / NACK feedback is not signaled to transmitter 180, retransmission may occur multiple times depending on system requirements and QOS restrictions, radio bearer selection and available bandwidth. HARQ storage and soft combining methods are needed for efficient receiver 113 processing. The HARQ storage and soft combining may be independent of data length or format, and decoding may be performed upon receiving the last transport block transmission.

According to an embodiment of the present invention, the system may be configured such that the receiver 113 stores the transport block received from each transmission without information on the data length or format, Performs blind decoding, and also verifies the data length and format.

According to an embodiment of the present invention, in the transmitter 180, the transport block is encoded by a forward error control coding scheme, and after selective operations such as interleaving and scrambling, modulation and transmission are performed wirelessly. The transport block may contain a cyclic redundancy check (CRC) bit for error detection. Correspondingly, the receiver 113 performs detection on the received transmission block after the selective descrambling and deinterleaving operations according to the operation of the transmitter 180, and the HARQ processing method of the present invention is performed.

3 is a flowchart illustrating an operation of HARQ processing according to an embodiment of the present invention.

3 is a flow diagram of operations of HARQ processing and blind decoding for a predetermined number (e.g., K) of possible information data lengths according to an embodiment of the present invention.

Referring to FIG. 3, the transmitter 180 transmits the encoded transport block along with the information data length selected from K, which is a possible length. Receiver 113 receives the encoded transport block in step 300 and the detector of receiver 113 outputs the LLRs of the received transport block. In step 302, descrambling of LLRs values from the detector is performed, and in step 304 de-interleaving of the descrambled LLRs values is performed from the descrambler. In step 306, it is determined whether the transmission is the first transport block transmission. If it is determined to be the first transmission, in step 308, the receiver 113 stores data in the HARQ buffer. If the ACK / NACK mechanism is used as determined in step 312, the receiver 113 performs K rate reverse mappings once for each possible data length up to steps 314 and 318 (e.g., 1, data length 2, ... data length K).

From step 316 to step 320, the receiver 113 performs blind channel decoding for a possible data length for each of steps 314 to 318. In step 322, the receiver 113 performs data length selection after decoding for all possible data lengths. If the ACK / NACK mechanism is not used, as determined at step 312, the receiver waits for a subsequent retransmission. If the transmission is retransmission and not the first transport block transmission, as determined at step 306, the received transport block is soft combined with the stored transport block transmitted and stored in step 310 above.

The receiver 113 performs K transmission rate inversions (for example, data length 1, data length 2, ... data length K) once for each possible data length in steps 314 and 318. From step 316 to step 320, the receiver 113 performs blind channel decoding for a possible data length for each of steps 314 to 318. In step 322, the receiver 113 performs data length selection after decoding for all possible data lengths.

The term "blind" means not only data length but also other decoding parameters associated with a received transport block are unknown. For example, the specific data format (s) fitting the data length, the possible scrambling sequences applied to the CRC parity bits, and the precise location of the reserved codewords in the HARQ buffer are unknown.

The blind decoding attempt is performed once, assuming one set of decoding parameters. This depends on one data length and a fixed spare codeword location. If there is a reserve of a scrambling sequence for a plurality of spare data formats or CRC parity bits, only one decoding attempt is required.

If the precise location of the reserved codewords in the HARQ buffer is not known, then multiple decoding attempts may be needed once for each possible location. The decoding attempt (s) for each preliminary data length, other subsequent-processing, will be performed to identify these related parameters. After the K sets of all K decoding attempts or decoding attempts are terminated, the data length selection is performed in step 322 and determines not only the data length but also other related parameters.

In step 322, the data length selection may be performed by a simple calculation of metrics based on the statistics obtained in the decoding process. For example, the normalized correlation soft metric NSCM may be defined by equation (1). The equation (1) is as follows:

(One)

와

는 전송율 역정합 후의 i 번째 LLR 입력과 정보 데이터를 위한 재 인코딩된 코드 워드의 i 번째 비트를 나타낸다. L 은 마더 코드의 길이를 나타낸다. NORM 은 다음과 같은 수학식 (2)로 정의된다:From here,

Wow

Represents the ith bit of the re-encoded codeword for the information data and the i < th > LLR input after rate inverse mismatch. L represents the length of the mother code. NORM is defined by the following equation (2): < RTI ID = 0.0 >

(2)

It is normalized to L1-norm and may be referred to as L1-NSCM. NORM is used in the following equation (3): < EMI ID =

(3)

L2-norm, the metric may be referred to as L2-NSCM. When channel decoding passes CRC (or other error detection criteria) for a plurality of spare data lengths, the data length selection is performed by comparing one NSCM value selected with the data length to one of the maximum NSCM values.

In accordance with an embodiment of the present invention, a plurality of HARQ buffers may be used after a rate reverse mating instead of using one HARQ buffer for storing before performing a rate reverse mismatch, and one for each spare data length may be used . The processing of the receiver 113 may include performing HARQ processing before rate reverse mating as shown in the step of FIG. 2B.

4 is a flowchart illustrating an operation of HARQ processing according to an embodiment of the present invention.

4 is a flow chart illustrating operations for processing a plurality of HARQ buffers for storage of rate-mismatched transport blocks having a plurality of data lengths. Referring to FIG. 4, the transmitter 180 transmits an encoded transport block. Receiver 113 receives encoded transport blocks. In step 400, the detector of the receiver 113 outputs the LLRs of the received transport block. In step 402, descrambling of the LLR values from the detector is performed, and in step 404, de-interleaving of the descrambled LLR values is performed from the descrambler.

In step 406, the receiver 113 processes two possible data lengths, but in step 416, the receiver 113 is not limited to processing two data lengths, A plurality of data lengths can be processed. In step 406, rate reverse registration is performed for data length 1. In step 408, it is determined whether the first block transmission is performed. If the transmission is determined as the first transmission, in step 412, the receiver 113 stores the transmission block in the HARQ storage buffer. If the transmission is retransmission, that is, if it is determined in step 408 that the transmission block is not the first transmission block, the received transmission block is soft-combined with the stored transmission block from the previous transmission in step 410.

In step 414, the receiver 113 performs channel decoding for data length 1. In step 416, a rate reverse mapping is performed on the data length 2, which is a data length different from the data length 1. In step 418, it is determined whether the first block transmission is performed. If the transmission is determined as the first transmission, in step 422, the receiver 113 stores the transmission block in the HARQ storage buffer. If the transmission is retransmission, that is, if the determined transmission block is not the first transmission block transmission in step 418, the received transmission block is soft combined with the stored transmission block from the previous transmission in step 420. In step 424, the receiver 113 performs channel decoding for the data length 2.

According to the embodiment of the present invention, instead of performing HARQ processing before performing the rate reverse registration, a rate reverse registration may be performed before performing HARQ processing as shown in FIG. 2A.

5 is a flowchart illustrating an operation of HARQ processing according to an embodiment of the present invention.

FIG. 5 is a flowchart illustrating an operation for processing the receiver 113 having a single HARQ buffer and data length selection, but the rate reverse registration is performed a plurality of times, once for each spare data length. Referring to FIG. 5, a transmitter 180 transmits an encoded transport block. Receiver 113 receives encoded transport blocks.

In step 500, the detector of the receiver 113 outputs the LLRs of the received transmission block. In step 502, descrambling of the LLR values from the detector is performed, and in step 504, de-interleaving of the descrambled LLR values is performed from the descrambler. In steps 506 and 518, the receiver 113 processes two possible data lengths. In step 506, rate reverse registration is performed for data length 1. In step 508, it is determined whether the first block transmission is performed. If the transmission is determined to be the first transmission, then in step 510, the first transmission block is decoded. During the first transmission, decoding is performed in step 524 to enable data length selection according to the method described above, e.g., by comparison of NSCM values.

If the data length is selected to be 1 as determined in step 526, a single HARQ buffer stores the transmission rate mismatched transmission block according to the selected data length 1 in step 528. If the data length is not selected as 1, as determined in step 526, a single HARQ buffer stores the transmission rate mapped transmission block according to the selected data length 2 in step 532. If it is determined in step 506 that the data rate is 1, the transmission is retransmitted as determined in step 508, and if the data length is selected as 1 in step 512, in step 514, The received transport blocks together with the stored LLRs are soft combined.

In step 516, the receiver 113 provides channel decoding for a data length of one. If the data length is not selected as 1 in step 512, the receiver 113 performs channel decoding in step 516. If it is determined in step 518 that the transmission rate is inversely matched and the transmission is retransmitted as determined in step 520 and the data length is selected as 2 in step 530, The received transport blocks together with the stored LLRs are soft combined.

In step 536, the receiver 113 performs channel decoding for data length 2. If the data length is not selected as 2 in step 530, the receiver 113 performs channel decoding in step 536. In step 520, if the transmission is determined as the first transmission, the transmission block received in step 522 is decoded. During the first transmission, decoding is performed in step 524 to enable data length selection according to the method described above, e.g., by comparison of NSCM values.

If the data length is selected to be 1 as determined in step 526, a single HARQ buffer stores the transmission rate mismatched transmission block according to the selected data length 1 in step 528. If the data length is not selected as 1 in step 526, a single HARQ buffer stores the transmission rate mapped transmission block according to the selected data length 2 in step 532. As shown in FIG. 5, the receiver 113 performs processing for two possible data lengths, but is not limited to two data lengths according to an embodiment of the present invention.

According to an embodiment of the present invention, the transmitter 180 transmits a transport block for physical layer information having a plurality of sub-blocks. At this time, each sub-block has an error control code for encoding the information data of each sub-block. Also, there may be a repetition of one or more sub-blocks by another sub-block. This generalizes the transmission format using the MTC physical downlink control channel (MPDCCH).

The length of the information data of each sub-block may be selected from the set of preliminary data lengths. The data length of the entire block of information data and / or the data length of each sub-block of information data is not known to the receiver 113. [ Transmitter 180 may choose to retransmit the same information data multiple times to achieve the desired quality of service (QOS) performance.

The retransmission may or may not be dependent on the feedback signaling of the receiver 113, such as ACK / NACK for the transmitter 180. The above-described processing method of the receiver 113 can also be applied to the operation of each sub-block. When the same part of the information data of a plurality of sub-blocks is repeated, they are self-combined and stored in a single HARQ buffer for the same part of the information data.

The operations described with reference to FIGS. 3-5 in accordance with various embodiments of the present invention may also be applied to each sub-block (HARQ storage may be applied to the sub-block after self-combining if there is repetition).

For example, one sub-block HARQ buffer (a well known section of a HARQ buffer for an individual buffer or an entire transport block) is used for each sub-block. Receiver 113 first performs descrambling and deinterleaving operations on the received information data of each sub-block. If it is the first transmission, the information data before performing the rate reverse matching is stored in the sub-block HARQ buffer.

If an ACK / NACK feedback mechanism is used for each sub-block, the rate reverse mating will be performed a plurality of times for each possible data length, and after decoding for all possible data lengths is complete, Is performed. If the ACK / NACK feedback mechanism is not used,

That is, the retransmission (s) are performed regardless of how the receiver 113 handles the first transmission, and the received information data of each sub-block from the first transmission after descrambling and deinterleaving is stored, It is not used for decoding.

In the case of retransmission, the received information data of each sub-block is soft combined with the stored information data from the previous transmission, K-times rate reversed once per possible data length of each sub-block, and channel decoding is performed. After all K decoding attempts have been completed, the selection of the data length will be performed to determine the data length of each sub-block.

According to an embodiment of the present invention, a receiver receives coded data from a wireless transmitter, the coded data includes information data coded by a coding scheme, retransmits coded data from a wireless transmitter, Processes the coded data without information on the data length, and determines the data length of the information data.

According to an embodiment of the present invention, the system can be tested in the concept of decoding a physical side link control channel (PSCCH) in the 3GPP D2D proximity service environment. Link-level simulators for these environments can be used. Transmitter 180 may choose to transmit a transport block having a data length of 53 bits or 60 bits, including 16 bits for CRC.

The transport block is encoded with a tail-biting convolutional code with a memory length of six. The simulation can be performed on an additive white gaussian noise (AWGN) channel with a bandwidth of 1.4 MHz. The present system has a receiver 113 having a data length of 53 bits, whose service class indicator (SCI) format is 0 and which is unfamiliar to the receiver 113 unlike the conventional system, and which follows the processing scheme shown in FIG. 2A ≪ / RTI >

FIG. 6 is a diagram illustrating a decrease in frame error rates (FER) in wireless communication by HARQ processing according to an embodiment of the present invention.

Referring to Figure 6, the method and apparatus can reduce the frame error rate (FER) by physical shared control channel (PSCCH) operation in the presence of additive white Gaussian noise (AWGN) with a bandwidth channel of 1.4 MHz or more . The FER performance shown in FIG. 6 indicates that the method can achieve the same performance as a conventional system using known data lengths.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

110: communication block
120: Processor
130: memory
140: Sensor block
150: Display
160: input / output block
170: Audio block
180: Transmitter

Claims (10)

The receiver receives data from a wireless transmitter,
The receiving unit receives the data retransmitted from the wireless transmission unit,
Wherein the receiving unit stores the data,
Wherein the receiving unit processes the data without information on the length of the data,
Wherein the receiver comprises determining a data length of the data. The method according to claim 1,
Wherein the receiving unit processes the data by performing a hybrid automatic repeat request (HARQ) process before performing a rate dematching. The method according to claim 1,
The receiving unit processes the data,
Combines and stores multiple blocks of received data,
Perform rate dematching on the combined and stored blocks for the received data for each of multiple data lengths,
Blind decoding the rate-rejected block for received data for each of a plurality of data lengths,
Determining a data length based on the rate inverse and the blind decoded block with respect to received data. The method of claim 3,
Wherein determining the data length comprises performing an operation on statistical metrics obtained from the blind decoding. The method according to claim 1,
The receiving unit processes the data,
Perform rate dematching on the received data block for each of multiple data lengths,
Combining and storing the rate-mismatched received data blocks for each of a plurality of data lengths,
Blind decoding the combined and stored blocks for received data for each of a plurality of data lengths,
Combining and storing the received data, and determining a data length based on the blind decoded block. The method according to claim 1,
The receiving unit processes the data,
Performing a rate reversal on a block of the received data for a plurality of data lengths,
Blind-decoding the rate-unmatched block for each of a plurality of data lengths,
And storing the received data associated with the selected data length in a single HARQ buffer. The method according to claim 1,
The retransmission of the data to the receiver
Wherein the radio transmitter is not performing NACK. A receiving unit; And
Including storage,
Wherein the transmitting unit transmits data to the receiving unit, the data is retransmitted to the receiving unit, the storage stores the received data, the receiving unit processes the received and stored data without information on the data length, The data length of the wireless communication device. 9. The method of claim 8,
Wherein the receiver performs HARQ processing before performing a rate reverse registration. Receiving data transmitted by the wireless transmission unit,
Receiving the data retransmitted by the wireless transmission unit,
Storing the data,
Processing the data without information on the data length,
And a chipset for determining the length of the data.

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